Yeah the sync dock is $50...so if you can pick up an hemi cable for under $40 (which you easily can) it is the cheapest one...make sure it is hemi comparable as the older docks won't allow HD resolutions

with no remote it is not possible to navigate the menu of the HD. so you wont be able to watch videos.

as for the aux...i dont know what to tell ya. i usually have my zune volume on 15-ish and have the stereo on like 20 something....but all stereos are different. you just have to play with it. i would go max 20 on the zune volume, and just up the stereo from there until you are happy